Financial Instruments and Hedging Activities (Additional Information) (Detail) (USD $) In Millions, unless otherwise specified					3 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2013 Derivatives Not Designated as Hedges	Sep. 30, 2013 Derivatives Not Designated as Hedges	Dec. 31, 2013 Derivatives Not Designated as Hedges Maximum
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Term of foreign currency forward contracts					90 days
Derivative, Notional Amount			$ 330.8	$ 247.8
Estimated fair value of long-term debt	2,431.5	2,458.2
Long-term debt, face value	$ 2,471.0	$ 2,472.2